batch file to search and replace a string

Question

I need a batch file that should search the PC for all files issued today named as \"example.ini\" and replaces a string which will be in the second line of \"example.ini\", it s

Answer 1

Change String1 by String2 in the second line of files named example.ini that has been created today in any subdirectory of drive c:

@echo off
    setlocal enableextensions enabledelayedexpansion

    rem Arguments:
    rem     %1 = search string
    rem     %2 = replace string
    rem     [ %3 = file in where to replace ] 
    rem            this parameters is internally used by the 
    rem            batch file while processing

    rem chech for parameters
    if "%~2"=="" goto :EOF

    rem retrieve parameters
    set "_search=%~1"
    set "_replace=%~2"

    rem check if asked to replace in a file 
    rem this will be done recursively from this same batch
    if not "%~3"=="" (
        set "_file=%~3"
        goto doFileReplace
    )

    forfiles /P C:\ /S /M example.ini /D +0 /C "cmd /c if @isdir==FALSE findstr /c:\"%_search%\" \"@path\" >nul && %~dpnx0 \"%_search%\" \"%_replace%\" @path "

    goto :EOF

:doFileReplace
    echo "%_file%"
    set "_tempFile=%temp%\%~nx0.tmp"
    break > "%_tempFile%"
    (for /F "tokens=1,* delims=:" %%l in ('findstr /n /r "." "%_file%"') do (
        if %%l EQU  2 (
            set "_text=%%m"
            echo !_text:%_search%=%_replace%!
        ) else (
            echo %%m
        )
    ))>>"%_tempFile%"

    copy /Y "%_tempFile%" "%_file%" >nul 
    goto :EOF